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Use Gimp. Not Aqua, but powerfull.

I did some builds:

www.wilber-loves-apple.org

Why pay for some huppy fluppy coreimage tools, who looks great, but has limited functions. Gimp ist really powerfull and open-source.

By the way. Seashore ist not Gimp. It's based on an old version and has only limited functions.